Manganese-steel stamp-shoe.



P. A. HAUGHTON. MANGANESE STEEL STAMP SHOE.

APPLICATION FILED 11,111.21, 1912.

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- purposes and at the UNITED STATES PATENT V ()FFIGE.

I FRANK A. HAUGH'ION, 0F ILION, NEW YORK.

MANGANESE-STEEL STAMP-SHOE.

Original application filed October 19, 1911, Serial No. 655,491. Divided and this application filed March 21,

Patented Feb. 3, 1014.

1912. Serial No. 685,382.

To all whom it may concern Be it known that I, FRANK A. HnUqH'roN, a subject of the King of Great Britain, residing at Ilion, in the county of Herkimer and State of New York, have invented certain new and useful Improvements in Manganese-Steel Stamp-Shoes, of which the following is a specification.

This invention relates to manganese steel stamp shoes, the object of the invention being to provide an improved stamp shoe which will embody all of the good wear ng qualities of manganese steel for. crushing same time have the requisite degree of toughness at the polnt of juncture between the shank and the body thereof.

The present application is a d1v1s 1on of my contemporaneously pending application (allowed) Serial No. 655,491, filed October 19th, 1911, and now Patent No. 1,083,800, dated July 30, 1912.

In the drawing accompanying and forming part of this specification the figure illustrates a stamp shoe made in the manner set forth.

Stamp shoes as usually made are so brittle that the shanks frequently break off, and this is the case especially when the shoes are made of chilled cast iron. The heads of the stamp shoes are usually about nine inches in diameter, and owing to this large body of metal in the head of the shoe when made of manganese steel and treated in any of the ways in which this steel is treated it has been found by actual experience that shrinkage cracks develop in the metal, extending over a considerable portion of the interior and at times extending to the outer surface, so that the shoe is defective and in capable of performing the work for which it was designed. It is, however, essential that the metal adjacent to the point of juncture of the shoe body and its shank he toughened, so that there will be no danger of the shank being broken from the body by the severe shocks which it receives in service, and I have discovered that by heating the shoe to the usual temperature to which manganese steel is heated, as for instance about an orange heat, and immersing the shoe in a suitable bath, such, for instance as water, shank downward, until the portion of the body immediately adjacent to the shank is submerged about an inch and a half and allowed to remain in that state until the entire shoe is cooled or cold the shank and the portion of the body adjacent thereto is toughened, while no shrinkage cracks develop in the body of the shoe. By this process I obtain a stamp shoe which embodies all of the good wearing qualities of manganese steel for crushing purposes, and at the same time obtain the requisite degree of toughness in the shank and in the body of the shoe adjoining such shank.

In manufacturing stamp shoes in the manner set forth, after the shoe is cast it is heated to the desired temperature and then immersed and supported by any suitable means, in a quenching bath of a suitable fiuid, such for instance as water, suificiently to immerse the shank l and a portion of the head 5 adjoining such shank, and there allowed to remain until the entire shoe is cold, whereupon it is removed. By this process it has been found, as hereinbefore stated, that the shank and that portion of the body adjacent thereto is thoroughly toughened, and that no shrinkage cracks develop in the body of the shoe, while the remaining portion of the body is sufficiently tough to fulfil all the requirements of a stamp shoe.

I claim as my invention 1. A manganese steel stamp shoe comprising an integral head and shank, the shank and a portion of the head continuous with such shank being tougher than the remaining portion of the head, while the shoe is free from internal strains and cracks.

2. A manganese steel stamp shoe comprising an integral head and a shank, the major portion of the head consisting of heat treated manganese steel, and the shank and the remaining portion of the head continuous With such shank consisting of heat treated and water cooled manganese steel, whereby the shoe is free from internal strains and cracks while the shank and that portion of the head adjoining such shank is tough.

3. A manganese steel stamp shoe comprising a one-piece casting consisting of a head and a shank, the whole of the shank and a portion only of the head continuous with such shank consisting of heat treated and fluid cooled manganese steel, whereby the shoe is free from internal strains and cracks While the shank and the continuous portion of the head adjoining such shank is tough.

4:. A manganese steel stamp shoe comprising a one-piece casting consisting of an integral head and shank, the major portion of the head consisting of heated but gradually cooled manganese steel and that portion of the head continuous With and adjoining the shank and the Whole of the shank of heat treated and Water cooled manganese steel, whereby the heated but graclually cooled portion is free from internal strains and cracks and the treated continuone portion adjoining the juncture point of the shank and head is tough.

Signed at Ilion, N. Y., this 19 day of March 1912.

FRANK A. HAUGHTON.

Witnesses:

J OI-INSON MORGAN, J. E. BRENNAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

